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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91d6d646e2e6c3f0f592f29d111808d39256ffad97e08b3cad38d357716302c' 
  AND token = 'Yae4n6znCB+cceSmJ66zSW5ESd3YGu5mt5YXaP93Ak4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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