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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87655fe24ea987d2195634a4c48ca266dd300f2d8b720cab9fee98323419158f' 
  AND token = 'p5f1seinTCpf93UoT04XI/zp4P6AArsbbfDXQCurLmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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