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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e10122e1d4bedce8cc0bf629984579b4d2ccd832c664fa5604d60b9959895e6' 
  AND token = '6ksC7HsmtwGx7EFumEe0E6/vGqlEbv7J4C2L0kbmxkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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