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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6049935d62b13b011767069467235304e7b577fc26a74c041ad41d3feae68e0d' 
  AND token = 'ieWxWK3YglODwEmhBr7KOJjtTJE93mlwezsyeXo98XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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