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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad37acd654189b7229a2d5a47a5628e3616d601e624ae139d7e1c00711dc104' 
  AND token = 'oGoKEjTpMtnnfE7eIJs0QyTUhkTv3tuPRhwcg47mBUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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