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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba43a8ddc21108427b97f6fdde6ecce0d99ffafef47e99bc7498d34dd0e88e79' 
  AND token = 'FqOTN8IAUY2nWBwgpaGAiCHy9H+l0WIXXvwEPADO46U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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