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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a952a85fc8cff79f7aae59d6f4ca45d56a5cbe404ef0452770751be59c94e14' 
  AND token = 'rOkBJyE/y1c/SmN6JpaS3Vzxpr82+Zum1o9PlHHzPu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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