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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5705f79c1b5b2c74ba2a9ce0e1419e83e997da98638019d3bc20ad427eb8ebb' 
  AND token = 'W/LLqeuny1XKq8WpIezcpHQtABEHpkA7DzNyk076qDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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