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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ef52afc274c151ab72e0d73ae858197291cb6166352cb16c4fbf1c98241be8' 
  AND token = 'iMN92QMfH3Rv03baN4vOzhcUZyTriI4LOSJgTmPgYy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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