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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32d0a4f1317f2f3b32588bd2b5847f7a1a62cf7282ecc430c24d11dba0b82e1' 
  AND token = 'pRAEhrrO3C2WDpGIsUJ/Hrinqm5s33vc1wbH4da9cYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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