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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e062ef56025b79d329ae1eb2c6269703a83cd1454ae2c89147710a14e6c90a' 
  AND token = 'o/U+69mumjcqdh95S7ECj4ptzN+EVkklMn1LjEaygPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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