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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2e3f7e2bfd94a0357eb6a8f6189a0ee38c298dc71cff1827e748beeb479c0b' 
  AND token = '/KA+rM9Uos2m1OJDudObAAXlX9xxIwgynT7YCmC/6aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}