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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a6e8be20ac35e3babb8cc3120c63b508b297bfb94b65105b8c3cffb93d8425' 
  AND token = 'Bv0i/LYNCFWOl+Gd/qQDu3GRD+THObZAqA1TcU1y2BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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