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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7a71761ecad09ac2e3445f5c666fad5e1264e74ac9a3df14230e3a58899ea6' 
  AND token = '3aatlcX7FW2BQqzyH6+Cc5BO2Qh+DeQHSHc7lgBqGpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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