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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5142ab56eaaebb0ed8610e87782629761ae802bc2ada5bbe4e513b88a161167' 
  AND token = 'lmbR6JK3oJKtYJCV+kNJ7yUM+w9GefBkvcBwBS3pXjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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