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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736b6cbca8488d3d7d6e89ea0ec44dfc2b911041f11566a8f6f5981d4554393a' 
  AND token = 'Sy6pGOHeKf9Mxbi+3rM8Ch45f2sR0X+DtJ0o9w/H4Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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