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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d5e5668956dc13e79b98b9d97e2714c23ab8a571f0974cbb485bc7d397816e' 
  AND token = 'gIHBR41SuOZuxT5Q59nks1GfNZ6TV4z7lP7P8xC/ERE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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