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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3afaa2049e27142db0c8cab31f090f778e01218c11be4ab4ed77263980f50a' 
  AND token = 'BbokwY2uYxLXdALDdIex0Vv1MyBjebB1Sz/7cbtIR3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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