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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda2a40304b5f70260e438ab6de7c38a297ab52953d5fb86642c2120f8657e1a' 
  AND token = 'PW5iLdDXh8oyLlcfGBVCcADgXUYELl1uXG3F5H2StwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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