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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cafa4dd73bb39c130dbdc77299f9584bab8eb76d947aba62054a97428a7c3e' 
  AND token = 'X2johulFv4e9/VmEvlb6keRk6BkX2hJajfdcg0QMJh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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