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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777800ec1d0f01e874d2d51d791db76697d6a87ef092a2ec8812f8ad43c73df1' 
  AND token = 'f2NWz59uGbTLBoGN3e6AZPl/ZwWd1HQvyguim1756Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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