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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92fbf9b47970850266fb0454b4ac7dc1f7ef009e6c2402ead7e1b25102fe801' 
  AND token = '3rue9ssGl3tR12nBDSdTHvmfBD+P+z4Shdz1HGbU9qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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