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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e32de3e7293d2cd4e83997802f2920835e3be3fab4e4688223c79c4eba4176' 
  AND token = 'hZIJ9ABheEgAAaAm+5eroyZfhceAGo2LwkE8moIhKFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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