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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae30a0333112a8c75f931bbcf6ffff6ed662e28b24e6572f1c87ab528a77e80' 
  AND token = 'L7dqfZqjEoZuXPKOOf8z3vZwBaLWEXIoJPJKcBx20lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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