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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95fa6475ec499b9f03112e289a908851cc12361935f88df7c2e939a2c28e34b' 
  AND token = '3aChf/3OgWlbwsg+mdUoo7ENJDNxrdfGMwm4FDxEl1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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