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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d75821781c15d2fdfbf8a33f46a522a1cd289e9b17661e43160cedd48ce578' 
  AND token = 'aN/Upp7a8XGHq4ja7+dGdGqJVIten+47hkn9YSSoB5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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