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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35845db8918299bb7da3ec4311d340a9a3695043368828c30c8eb5cc17a8ac0' 
  AND token = 'tXopIv+wo7ygJlI9rI9Fj31eEMPDbY34HCJh+VH3x5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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