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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdb159b90c8e4408d13ed8a7137e4359278688fe0f85f9c71cbd0bf24db2c6e' 
  AND token = 'eGrkU7hYpy5iGMVTy8oLrmippx7XlntPouTpIesczXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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