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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee2fba00ae5171d9e0227d7d4ecb15990b766d04785bb11bc868eb30b305179' 
  AND token = 'CJni9Um7Ul5nBECpqveQWVtAWV8/klVumjcceaw8OHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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