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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600cb5955160fea757f867e4e559edaafe0c9899f23ea0c4dde1887e8a72d1eb' 
  AND token = 'SytwRaY8ycBDVUx2nzmmbx4BTTpJbJCHjwLCiJrgDT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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