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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c66fbb59ab6f909d2cfff4a5300688f0b472852bc5cd0356d52b5cf4eb27f41' 
  AND token = '4p4NW+p2G0Nkir/HMoulELmJOkhsUTWdjyIVaGjbOF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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