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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4011df4cb41e250fcdadeedf132a2a3f250a063a53866ec78ac9a4a6ec6382fe' 
  AND token = '4ZvjLvCdIlBCKWIJh/UIntNa4IS4US+f0Phu6mXu8G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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