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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579b677d50f3a59b539585f9f96f097ecca1eb9b6d5652deafd448441ad4a506' 
  AND token = '90gSunqUZZ8EjNw4umIQ1NN9z5OjH3uud4ctVuEMi/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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