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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77993d36b4f52fedce0cfedd275278f6e8f24aadd4e3262f6442363147e31d02' 
  AND token = 'lZfPl9SD4yUsKxrBy+fM1vz7C5RcjACeJ9YM/jcqNR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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