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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1987223182dfe002a4a82575d94d9c61c4afbc1ba5a25f326155585ba6c2a6' 
  AND token = 'XdzgnUyel2R84iB1KUKmSvtd0jywboFnGWpuBto8J8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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