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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b360e807b2ed0457faef94d356e82733fb1046c80636317ecf1659224f509f3f' 
  AND token = 'XarWgcGYJzGccBNWx+rV1bM4jczk94F3rTdGA9+c96I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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