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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32166204d207ce005dc7441c92e8c31030f3d6888d203759c266b4774e44a3a5' 
  AND token = 'XiyPDRdybho/RRAsA3Yl7asnvKmQFHoU+fEE+C6Vtiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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