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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2be5e1f814a4578a5974b71ed284cf90a95be5b045d48fc83c4f2ec214afa11' 
  AND token = 'NebJVaKJFlwg6RpDJ6U9X/NRU3lt5hG6g1V3/PEJefg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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