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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064387b3d92bea7d3bab68c2bf2bb58cebfe33916c4501466b19bcd68b9018f4' 
  AND token = 'uoMCp5T36meYyCBRZuC6yBmgyXIOA3jQlt7lVdjp6gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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