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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31291110e8d1fd83397f0b17904c2328cf508125f9a4c1c974116c547e43a81' 
  AND token = 'NWwYLU+FROvGjQpdQaxNjGQArgpgzwAOnxsz9ZN9GyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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