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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eda1802694f856d5ee064b3fa52e62bf300633a2f73416e2e0aed92c084f030' 
  AND token = 'CvYKyfQHiboHPyAwJge67uNJryr3ZoDHTblyT/KkCpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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