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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a086ea9443d86b58e23cdc6647111dbfe5f788282bc145e534c2bac06ca3ef77' 
  AND token = '7sDLY8pZQTj5xcyz9B34H2bt9EGpD8ef4SLijYn95ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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