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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181c9927326cc69ba07a5110ed0d0db242d8e0de891fa3bfe6d9bd2fa68df855' 
  AND token = 'ErQDocpMIh6wtvuAynivmVphPHMEiY/5OUUwOS9JMpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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