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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daacf4515361459e2cf70e05523e00b5795f761fcb2e4d826e7efbcb51e3350b' 
  AND token = 'D7M/J3tiX0y6CdnOVYiZKwwnhMja8F1hHPAkyCwc/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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