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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0ed0da7ca87cd834c1487cb4054ff16d832fcf20697d0820019d1b95e4f9a2' 
  AND token = 'RbuEcCv3GKEaPoOUbcuwLGguijMC8OIFwt7heHxME9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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