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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb7756f1abadfb08413862cbd7e54288eab837fe8b925ef0afe03c2d28a49fc' 
  AND token = 'ml8+q+tXGdFCyRTdoO54w3fg4OGMdDELlqsRpdAyCtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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