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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd240670c9bb915b7cf12b2d3bef1179d44cd6801d04d177b918d7938b635768e' 
  AND token = 'lqM0rqSbRGr1w+Hsxm56lr1oCWfqw+PWj/SZuamyhtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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