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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f5b4448224be69fc4b964dd6f0d884aa0bab9cb286b1f78be6149a13e9948b' 
  AND token = 'TBRJETgk6th3UDx3JnKR15ymlQ2VIr68MWZL0oSyd0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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