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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232c2168799b40ff84196f1c58ece9e901101027a834f42f285688bcd13fd375' 
  AND token = '5h0IhtlaaieV0HBOA5UhZsJX1Vic2vcKpQMpiH1ecxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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