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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590148399aa55565ee24edc485c9c50df4c752f7d5f9260cc115b93b7b1160a0' 
  AND token = 'a1kbppH0kw2YWK9NeeX6viA398CCFZf42tYY58ipNR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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