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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec5cd06ab9decc267e3a9b7fba31ef3991909b4b045fe019713a354984538ed' 
  AND token = '/Q9ZfttwhNl2x+teZgBNJ6vjr1oZbHW8+FJPFGO0RT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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