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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b559a6dfc40e27d652ee3b8872e49e8f99ae6c1ff7d48412c72349611dedb57' 
  AND token = 'HCIYtycoKhoRHw5iE5kMUV3H82hL67t3JtYon9uzGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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