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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0df5b2aef1babd8877bb39dffc1e46d4a9d915dc02c2087208a4012f39b183a' 
  AND token = 'r7WO1wZX+o57ZoJjr6ZS35Cts6kjw06ixgYzDSyKUeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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