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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfa1123775af877ffa9cbf8ca86c080574d5546476832d014a3acd7238536ae' 
  AND token = 'FW2NMz6DrQSJ07UDZDE2N8KKIRAq4rMhqdhCf7AavkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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