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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1141b7316199477953139fb67e50c8e07a87a5a6213f73979a1297abe9dbe2b0' 
  AND token = '/Trd+unJJqMrM/5hmhygzh+/dvimlU6s3gDWDY6p47A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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