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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bddb2df24648a325874d64962555ddea1391c979d828134684826caa9a2795c' 
  AND token = 'rFp7SmalEMnv1Ms6xNXK8a5gS53MOikhgW0rjelGGx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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