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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9a2a1894fcb9fe29a88bcf01f6cd19e1b36bd8bb33111566413cfe29914cf0' 
  AND token = 'pkmzCiA86/fQ9rqlptFPLyGJs9QHDQL373LTdRpG0MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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