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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2085259c86bd21ceee31e1e22ba0cf9986b629e2c3ee1d7ab84708b1c30429d' 
  AND token = 'awzcZpcRmTVQ5RBmNmWX9RZdpzSpM08Fs3CfCEQElq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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