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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e37313614a749fbb8e741ee45e3c7b470d380ce288a7ea484f7fee185afd8c' 
  AND token = 'ohODeO8X0qzm9HPMNaUx8/0H3RTEV95MrmNYZsuNHPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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