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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ccaf31b1cd5b39974f7fe00c718f5ea503205129020df771d424568f2ba09f' 
  AND token = 'zjzkHtAdel/EC+LHSr28ThVIz7roGUY6ZIynlHMEETs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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