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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a027d7a989e2d52c3160759558a7a55291f1587d4dade866c0ca7abc52e124b0' 
  AND token = 'a46o3K8N4QaxqolTibjjvf7+kccr78A4AKhthQqNLWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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