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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28e8cc8491c646a8c8f4b505053cdd15f6c3f7f2612ce9bf82df7a4b2b05c0f' 
  AND token = 'Pso5eFCNSjzOjOtAP4tyXvXQqAEccKYFuT18iyaSzPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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