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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4de4ed15ec07d892a289cb984cd01790988c01b5b113030bbd9948bb58ade1' 
  AND token = 'rfU4efi680QhqYzU1Y9MBZCu0CLnfa3fx7nn+x2iLTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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