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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6460b9b1b4deb271cf50df4b01cba909341978675e5ffce5f0dcb98a0793e3' 
  AND token = 'Bjihp3zpDHuki4kZARdOHoEFQEJdxugkie0slpbiDcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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