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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064f77e389b4374af1f78678b23e45c76033c7d51c48958ddcf8d80c8bfa51d2' 
  AND token = 'x+IPk4/jx7npXh24cGda32Hcxqcy3MCrrzwKWPP7DrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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